Improvement in circulating apparatus for steam-boilers



. ZSheets-Shefil. W. C. LANG. CIRCULATING APPARATUS MR; sI-EAM 301mm. N130,601, 12 Patented Aug.1,1876.

N- FETERS, HOTOiITHOGRAPHER, WASHINGTON, D. C.

W. C. LANG.

CIRCULATING APPARATUS FOR STEAM BOILER. No. 180,601. Patented Aug.1,1876.

N-F'EIERS. PHOTO-LFTHOGRAPNER. WASHINGTON. D C.

- UNITED STATES PATENT FFIE.

WILLIAM C. LANG, OF LIVERPOOL, ENGLAND.

Specification form'ing part of Letters Patent No. [80,601, dated August1, 1876; application filed July 24, 1875.

To all whom 1' t may concern:

Be it known that I, WILLIAM CUNNINGHAM LANG, of Liverpool, in the countyof Lancaster, England, have invented Improvements in, and applicable to,Steam-Boilers, of which the following is a specification:

My invention relates to that class of steamboilers in which the water iscaused to circulate through the shell of the boiler from a lower to ahigher level; and has for its object the prevention of leakage,corrosion, pitting, and deterioration of steam-boilers, (more especiallymarine boilers,) due to unequal expansion and contraction of the shellcaused by the lower temperature of the water, which lies near the bottomof the boilers.

For the above purposes I cause the water to circulate from the lowestportion of the boiler through the shell, thence upward into thewater-spaceat a high er level, preferablyat a point near thesteam-space, or into the steam-space itself. To insure that the watershall be caused to circulate from the bottom of the boiler to a higherlevel-that is, to a position where there is a higher temperature-- Iattach to the lowest portion of the boiler one or more water-boxes, andconnect them,

by suitable pipes, with the boiler, so as to draw the comparatively coldwater from the sides of the boxes, and deliver it into the upper part ofthe boiler; and inorder to prevent the-water in the boiler fromdescending and sediment-cock. Fig. 2 is a vertical section of a portionof a boiler and the waterbox, provided with the baffle-plate. Fig. 3 isa side view, partly in section and partly in elevation, of adouble-ended boiler, having my improvements applied. Fig. 4 is anelevation of one end of the boiler, &c., shown in Fig. 3.

Like letters of reference indicate like parts in each.

a represents a boiler, which may be of any approved form, and isprovided with a furnace, b. To the lowest part of the boiler I secure awater-box, c, which connects with the bottom of the boiler, eitherdirectly, as shown in Fig. 2, or, preferably, by means of a short pipe,0, and with the upper part of the boiler (preferably at or near thesteam-space) by a circulation-pipe, e. Passing through a gland on thewater-box c is a rod, provided with a hand-wheel, by means of which astopvalve, f, situated within the water box, may be operated to shut 01fthe connection between the bottom of the boiler and water-box, whendesired. I also provide the water-box with a cock, 9, through which anymud or sediment collecting in the box may be drawn off. When theconnection between the waterbox and boiler is direct, it is desirable'to break up the column of descending water, and for this purpose Iinterpose between the inlet and exit pipe a perforated plate ordiaphragm, j, termed a baffle-plate. To insure the circulation of thewater,.pans, pumps, or other, well-known mechanical appliances, may beinterposed between the water-box and the upper part of the boilerthatis, in thelength of pipe 6; or heat may be made the medium for inducingand maintaining the circulationas, for instance, pipes passing alongsideor through the fire-places. .For the purpose of completely illustratingthe devices in connection with a marine boiler, I have elected to showhollow fire-bars, marked 0, such devices being deemed best adapted tothe purpose. The circulation-pipes e are, by preference, caused to enterthe boiler at a higher level than shown on the drawings, and when thecirculation is caused by means of hollow firebars, check-valves may beplaced in the circulation-pipes below such fire-box.

The operation of these devices is as follows: The cold water from thebottom of the boiler sinks into the water-box c, descends upon one sideof the baffle-plate j, and passes through the perforations of thebaffle-plate, which break up, equalize, and check the column of water,and on reaching the opposite side of the baffle-plate, enters thecirculation-pipe 0',

passes or is drawn thence by any of the several suitable meansenumerated, and is delivered into the upper part of the boiler. When itis desirable to interfere with the circulation taking place through thewater-box, the valve f is forced in to cut off the connection between 1.In combination with a steam-boiler, the water-box c, communicating withthe lowest portion of the boiler, and provided with the.

baffle-plate, the circulation-pipe, and suitable means for establishingand maintaining the circulation of the water in the boiler,substantially as specified.

2. In combination with a steam-boiler, the box 0. substantially asherein described, provided with the cock g, connected with the boiler bythe circulation-pipes c e, the pipe 0 being controlled by the valve farranged-within the box, substantially as and for the purpose specified.

WM. 0. LANG.

Witnesscs:

W. B. J OHNSON, J. J oHNsoN.

